Community: This is a social feed that consists of posts everyone in the community you are currently viewing share to the whole community. Not everyone here will be a friend in your circle, but if you would like to add them, you can always send a friend request. (Each community is closed from one another, so the content here will be different for each community)
Magazine: This is a feed which consists of helpful articles, supportive post, and stories. The content here is related to the community you are viewing and posted by the community sponsor.
My Circle: This is a social feed that consists of posts you and the friends in your circle have shared within your circle. Any posts you share with your circle can be seen only by the friends in your circle. (If you are part of more than one community, your circle will have a different circle of friends for each community)